diff --git a/src/Adapter/AdapterDefinitionFactory.php b/src/Adapter/AdapterDefinitionFactory.php
index 3ca67d5..cbef22c 100644
--- a/src/Adapter/AdapterDefinitionFactory.php
+++ b/src/Adapter/AdapterDefinitionFactory.php
@@ -24,7 +24,7 @@ class AdapterDefinitionFactory
     /**
      * @var AdapterDefinitionBuilderInterface[]
      */
-    private $builders;
+    private array $builders;
 
     public function __construct()
     {
diff --git a/src/Lazy/LazyFactory.php b/src/Lazy/LazyFactory.php
index e6fe3cf..d00c307 100644
--- a/src/Lazy/LazyFactory.php
+++ b/src/Lazy/LazyFactory.php
@@ -20,7 +20,7 @@
  */
 class LazyFactory
 {
-    private $storages;
+    private ContainerInterface $storages;
 
     public function __construct(ContainerInterface $storages)
     {